Unique Compensation Effects of Heavy Metals and Phosphorus Copoisoning over NOx Reduction Catalysts

Pan Zhang; Penglu Wang; Sarawoot Impeng

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Unique Compensation Effects of Heavy Metals and Phosphorus Copoisoning over NOx Reduction Catalysts

机译：Unique Compensation Effects of Heavy Metals and Phosphorus Copoisoning over NOx Reduction Catalysts

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Selective catalytic reduction(SCR) of NOx from the flue gas is still a grand challenge due to the easy deactivation of catalysts.The copoisoning mechanisms and multipoisoning-resistant strategies for SCR catalysts in the coexistence of heavy metals and phosphorus are barely explored.Herein,we unexpectedly found unique compensation effects of heavy metals and phosphorus copoisoning over NO,reduction catalysts and the introduction of heavy metals results in a dramatic recovery of NOx reduction activity for the P-poisoned CeO2/TiO2 catalysts.P preferentially combines with Ce as a phosphate species to reduce the redox capacity and inhibit NO adsorption.Heavy metals preferentially reduced the Bronsted acid sites of the catalyst and inhibited NH3 adsorption.It has been demonstrated that heavy metal phosphate species generated over the copoisoned catalyst,which boosted the activation of NH3 and NO,subsequently bringing about more active nitrate species to relieve the severe impact by phosphorus and maintain the NOx reduction over CeO2/TiO2 catalysts.The heavy metals and P copoisoned catalysts also possessed more acidic sites,redox sites,and surface adsorbed oxygen species,which thus contributed to the highly efficient NO,reduction.This work elaborates the unique compensation effects of heavy metals and phosphorus copoisoning over CeO2/TiO2 catalysts for NO,reduction and provides a perspective for further designing multipoisoning-resistant CeO2-based catalysts to efficiently control NO,emissions in stationary sources.

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《Environmental Science & Technology: ES&T》 |2022年第17期|12553-12562|共10页
作者
Pan Zhang; Penglu Wang; Sarawoot Impeng;
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作者单位

State Key Laboratory of Advanced Special Steel,School of Materials Science and Engineering International Joint Laboratory of Catalytic Chemistry,College of Sciences,Shanghai University,Shanghai 200444,P.R China;

National Nanotechnology Center,National Science and Technology Development Agency,Pathum Thani 12120,Thailand;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境科学、安全科学;
关键词
Air pollution control Selective catalytic reduction; NOx reduction; Heavy metals; Phosphorus; Copoisoning;

Unique Compensation Effects of Heavy Metals and Phosphorus Copoisoning over NOx Reduction Catalysts

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